Incandescent electric lamp.



12W. LOVWDEN.

INGANDESGENT ELECTRIC' LAMP. APPLIGATION HL'PDy JAN. 14, 191s.

Patented Jan. 6, 191,4.

hoo-ks or similar independent supports.

UNTTED- sTATEs PATENT OFFICE.

TOM wIsEMANaJiibWDEN, 0E

LONDON, ENGLAND, AssIGNon To THE Ac'rON LAMP COMPANY LIMITED, or LONDON, ENGLAND. y

INCANDESCENI ELECTRIC LAMP.

Speccation of Ietters Patent. l Application led January 14, 1913. Serial No. 741,945.

Patented J an. 6, 1914.

T 0 all'fhom t may concern.'

Be it known that I, TOM WISEMAN MQW; DEN, a subject of the King of Great'rtm, residing at London, England, have invented candescent Electric Lamps, of which'fhe following is a specification. L

This invention relates to improvements in incandescent electric lamps, more especiallyto lamps with drawn filaments, and vvhas for its object the provision of a Support for the Y filament of such lamps which will enable ift to expand and contract without damage andI also to withstand the shocks unavoidable inl use and transit.

It has been proposed to support a continuous filament in a 'vertically disposed zig-zag and circular path by hanging it uponl light metal'hooks at each bend of the zig-zag, but 'diiiiculty has been 'experienced in rthat fusing yofthe metal occurs at the hanging points and causes breakage; local cooling at the, hook will' also sometimes cause break- Vg'1"his`invention consists in forming'supports for thefilament out of the :lila-ment itself, by looping it at the several bends 'and then preferably twisting such loops ropefashion, or welding the two parts of the loop together. These looped or twisted portions are bent overAboth at the upper and the lower ends of the bends, and the extreme ends of the same are then secured -directly to a non-conductive support by heating the glass supporting ridges, and embeddingthe ends ofthe twisted loops in the glass when heated to a plastic condition, or by attachingthem by paste or enamel by any convenient' method to the central stemv of the lamp; this allows of eliminating the usui filaments in short lengths are used a twisted loop may be formed so\as to serve as the support at one end of the central, stem, the

loose ends of the filament being welded tol tion; this isa point of great advantage as the point of support is usually the weak point of the filament asa whole and is most sub` .qect to breakage. certain new and useful Improvementsin ln- 'The invention is applicable mainly to a continuous filament of the drawn variety but may also bey used with a squirted filament having av plurality of separate sectionsjoined together, or where possible in a continuous length. v

The accompanying drawings illustrate the invention. i A

Figure 1 is a view of the complete lamp; Fig. 2 shows a line of filament being put into ,the lamp; Figs. .3, l and 5 show alternative forms of supporting sections' before being bent over; and Fig. 6 shows the application of the invention to the ordinary" hairpin filament.

The-*lamp bulb 1 is provided with the ordinary cap 2 and also with a central supporting rodv 3 upon which the filament 10 is mounted, the leading in wires, 4, 4being eov es l

brought in through the glass 5 in the ordinary way and connected to the filament. y

The filament is preferably formed of a continuous length as shown in Fig. 2, having each of the bends made with 'a twisted loop 6 and 7, at the top and bottom respectively, which is afte ward bent over and forms the connection ot the filament 10 withA the ridges 8 and 9 on thetlamp stem 3; the looped or twisted portions" are melted into .the glass ridges and thus firmly secure the lament thereto. j

ARigid 'supports may b'e used in placev of twisted portions at one end of the filament bends, and in the case of the ordinary hair pin filament as shown in Fig. 6, the bend 12 of the filament is advantageously looped or twisted to supportthat end while its free ends 'are supported by welded or other suitable connections of knownrform; such a connection is shown at 11, 11 where the wires 11 also carry the current from one filament to the next. i

The construction of the loops `may be varied according to circumstances; Fig. 3 is the preferred form being simply the lilainent doubled Von itself and then twisted.; Fig. 4 is the twisted form .when separatestrands of filament are used for each section, the ends being firmly secured by the twist; Fig. 5 illustrates the looping with twist, its sides being welded together with the aid of ahigh voltage current to strengthen the connection to the central non-conductive support.

It should be understood that the Figs. 3 to 5 illustrate the loop before being bent over to form the filament connection as shown in Figs. l and 2.

What I claim as my invention and desire to secure by Letters Patent is:

l. The combination, in an incandescentelectric lamp, of al lament in multiple line form, a non-conductive lamp portion disposed alongside the filament, and doubled integral and contacting portions of the tilament itself bent over to form its support from the said non-conductive lamp portion, substantially as set forth.

2. In an incandescent electric lamp, the combination of a non-conductive lamp portion, with a continuous filament having double contacting portions integral With itself throughout such contacting portions .y forming short circuited branches as supports for the said filament from the non-conductive lamp portion.

3. In an incandescent electric lamp, the combination of a non-conductive lamp portion, with, a continuous lament, having twisted portions integral with itself throughout, and forming the supports for the said filament from the non-conductive portion.

4;. In an incandescent electric lamp, the combination of a nonconductive lamp portion, with separate lengths ot filaments having portions of their ends joined together as double contacting branches which are bent over to form supports'from the nonconductive portion of the lamp.

5. In an incandescent electric lamp, the combination of a non-conductive lamp portion, with separate lengths of ilaments having their ends twisted together, such ,twisted portions being bent over toform supports from the non-conductive portion of the lamp.

6. In an vincandescent electric lamp, the combination of a'. non-conductive lamp porl tion, With separate len hs of filaments, one .end of each length being joined in contact with the end of the next length and such double portions being bent over to form one support from the non-conductive portion of the lamp, and rigid supports attached to the non-conductive lamp portion securing the other ends of the filament lengths by any' known connection thereto.

7. In an incandescent electric lamp, the combination of a non-conductive lamp portion, With separate lengths of laments one end of each length being twisted up with i the end of the next length and such twisted portions being bent over to forni one sup port from the non-conductive portion ot the lamp, and rigid supports attached to the non-conductive lamp portion securing the other ends of the filament lengths by any vknown connection thereto.

8. In an incandescent electric lamp, the combination of' a non-conductive lamp portion, With a hair pin filament having a double contacting branch bent over from .the bendto the filament to form a flexible Zag filament, and double integral and contacting portions of the filament itself bent over at the top and bottom of the zig-zag construction and embedded in the upper and lower flanges respectively of the central glass stem, all substantially as set forth.

1l. In an incandescent electric lamp, the combination of a central glass stem having upper and lower flanges thereon, with tilaments having supports formed by douhlerfl integral and contacting portions oi' the lilat ment itself embedded in one tlaiige ot the central stem, rigid supports embedded in the other flange of the said stem, and means for connecting the rigid' supports with the vfree'ends of the filaments, all sulfistantially as described herein.

In testimony whcreoi- I atlx my signature in presence of two Witnesses.

TOM VVISEMAN LOYVDEIQ'.

Witnesses:

H. D. JAMESON, W. E. ROGERS.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C."

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